Indicator



March 18, 1924; v 1,487,119

. C. A. 'NEWITT INDICATOR Filed Dec. 20 I920 abk cnuf specification, reference being had therein to relation of the same to the work to be trued Figure 2 is an elevation viewed at right the spindle of a chuck B upon a drill press.

Patented Mar. 1a, 1924.

tWiTED 'fiTAE'EE PATENT CHARLES A. HEWITT, or DETROIT, MICHIGAN. f

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INDICATOR.

Application filed December 29, 1920. Serial n5. 432,025.

To all whom it may concern:

Be it known that I, CHARLES A. NEwI'rT, a subject of the King of Great Britain and Ireland, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Indicators, of which the following is a the accompanying drawings.

The invention'relates to indicators adapted for application to revoluble spindles and for the purpose of accurately aligning the work to be operated uponwith said spindle.

The invention consists in the novel construction as hereinafter set forth.

In the drawings: Figure. 1 is an elevation of the indicator as applied to a spindlefand showing the angles'to Figure 1.

A is a shank adapted for engagement with a revoluble spindle, such, for instance, as

C is an extension of the shank A hinged thereto to form a'knuckle joint by the pivot D and provided with adjustment means such as the arm E extending in rear of the pivot and engaging an annular shoulder E of an adjusting screw F and spring G for varying its distance from the shank A. H is a housing at the outer end of the extension 0, in

which are arranged multiplyinglevers I including a bellcrank lever J, which is fulcrumed eccentric to the axis of the shank and has an arm J extending substantially parallel to said *axis and outward from said housing. This arm J is guided in a slotted member K which is mounted upon the housing H and at the outerend of the arm J. is a rounded knob or contact member J Sleeved upon the extension G is a ring L which is fixedly attached to a longitudinally slidable member M guided in slots in the hub E of the arm E andthe hub H of the housing H. The end of'the member M,

spindle.

of the member M to prevent the same from swinging out of engagement with the .slotted end of the lever I. This member in turn will adjust the ring L longitudinally of the member C.

ice..-

It is the usual practice in the drilling of work with a series of holes which are accurately spaced in relation to each other to first position a seriesof buttons upon the work, and then to successively setthe work A with a button in exact alignment with the drill spindle. Then thus positioned, the button may be removed and the work drilled with the assurance that" the bore will be corectly positioned. .My indicator is adapted for such use andas shown, L is a button clamped to the work M? by means of a j clamping screw N. The button is preferably formed with a chamfered or tapered portion 0, over which the contact J 2 may. passinto engagement with the cylindrical portion of the button. Thus'to test whether the spindle is properly aligned with" the button, itis fed downward, causing the contact J to ride pp the incline O and onto the cylindrical portion of the button and. as the spindle is simultaneously revolved, it is obvious that any eccentricity with respect to the; axis of the button will cause a movement of the multiplying levers I. This movement will be communicated to the memberM and ring L, shifting the latter longitudinally of the memberC. The member G maybe properly calibrated and the amount of deflection of the ring L thereon is-thus accurately indicated. 1 The work is then adjusted in position an indication of the axis that the'button is accurately aligned with the axis of the One advantage H' extending equally upon. oppositejsidesiof the axis and themultiplying levers within thehousing being similarly arranged, This counteracts centrifugal'action and also by condensing the structure avoids interference 'with the work. Adjustment of the contact I J 2 towards orfrom the axis of the spindle is effected by the screw F, which by moving thearm E will rock the extension G on the hinge D, thereby carrying said point either towards or from the axis.

What I claim as my invention is:

1. An indicator tool comprising a shank for engagement with a revoluble spindle in 'until the ring L remains stationary, which is i of the construction is that it is substantially symmetricah the housing longitudinally of said spindle and connectin'g said indicator ring with said inultlplying levers.

2. An indicator tool comprising a shank "for engagement with a revoluble spindle in axial alignment therewith, an indicator ring surrounding and movable longitudinally of said shank, a'member connected to said ring and extending longitudinally of the shank, a second member apertured to receive and form a guide for said first mentioned memher, a housing mounted on said shank and extend ng "transversely thereof in symmetrical relation thereto, multiplying levers within said housing, one of said levers connected with said longitudinally movable member, a guide projecting from the end of said housing in offset relation to the axis of the spindle, and an actuating member for said multiplying levers engaging said guide and having a contact portion for engagemeat with the work.

3. An indicator tool comprising a shank for engagement wlth arevoluble spindle in axial alignment therewith, an extension at-V tached to sa d shankand angularly movable in. relation thereto, .an indicator ring surrounding and adjustable longitudinally of said extension, a housing mounted on'said extension and extending transversely thereof in symmetrlcal relation thereto, multiplying levers within said housing, one of said levers connected with said ring, a work contacting member for actuating said levers arranged eccentricto the axis of the spindle, and means for ad usting said extension angularly relatively to said shank to move saidcontact towards or from the axis of the spindle.

4. 'An' indicator tool comprising a shank for engagement with arevoluble spindle in axial alignment therewith, an extension plvoted to said shank and angularly adjustable thereto, multiplying levers secured to said extension and extending transversely thereof, a movable contact for actuating said multiplying levers pivoted to said extension and having its pivot offset from the axis of the spindle, an indicator ring surrounding the extension and connected to said multiplying levers to be actuated thereby, an arm secured to said extension and a screw forming an adjustable engagement between said arm and shank by which said extension is angularly adjusted relative to said shank to move said contact member towards or from the axis of the spindle.

5. An indicating tool comprising a shank for engagement with a revoluble spindle in axial alignment therewith, an extension for said shank, a knuckle joint between said shank and extension permitting relative angular adjustment of the axes thereof, a member-having a slotted hub engaging said extension and an arm extending beyond said knuckle j oint, a screw extending transversely of said shank and having a threaded engagement therewith, and a swivelled engagement with said arm, a shoulder on said screw, a spring sleeved upon said screw and yieldably pressing said arm in contact with said shoulder, a housing having a slotted hub portion engageable with said extension, an indicator ring, sleeved upon the extension intermediate the hubs of said arm and housing, a member connected to said ring and slidably engaging the slots in said hubs, multiplying levers including a bell-crank lever, a connection between one of said levers and the last-mentioned member, said bell-crank lever-having one arm thereof onset from the axis of the spindle, and a guide for said bell crank arm mounted on said housing and extending outward therefrom. 6. An-indicator tool comprising a shank for engagement with the shank of a revoluble spindle, the shank of said tool having an extension, an indicator ring adjustable longitudinally of said extension, multiplying leversconnected to said ring'and extending transversely of said extension, and a movable actuating member for said levers ofiset from the axis of the spindle and having a contact portion for engagement with the work. In testimony whereof I affix my signature.

CHARLES A. NEVVITT. 

